diff --git a/frontend/e2e/tsconfig.json b/frontend/e2e/tsconfig.json
index e154323..1d9e5ed 100644
--- a/frontend/e2e/tsconfig.json
+++ b/frontend/e2e/tsconfig.json
@@ -4,10 +4,7 @@
     "outDir": "../out-tsc/e2e",
     "baseUrl": "./",
     "module": "commonjs",
-    "target": "es2015",
-    "lib": [
-      "es2015"
-    ],
+    "target": "es5",
     "types": [
       "jasmine",
       "jasminewd2",